Originally posted by: lyl523

Hi, my model can run use the small data from the excel (D_average4c1), but  when I  increase the number of  my data from the excel(D_average4c4), the cplex can run  for a minutes, then come  across the error:c0000005 EXCEPTION_ACCESS_VIOLATION

my model and data ：

//import data;

int nbWarehouses = ...;  //j
range warehouse = 1..nbWarehouses;

int nbDemands = ...;//  i 
range demand = 1..nbDemands;

int nbInstance = ...;// k
range instance = 1..nbInstance;

int nbType = ...;  //l
range type = 1..nbType;

int D_average1[demand][instance]=...;
int D_average2[demand][instance]=...;
int D_average3[demand][instance]=...;
float P[instance] = ...;
float T[demand][warehouse]=...;
int Q = ...;
int t1 = ...;
int N = ...;
//read the data to the D
int D[demand][instance][type];
execute{
    for(var i in demand){
  for (var k in instance){
   D[i][k][1]=D_average1[i][k];
   D[i][k][2]=D_average2[i][k];
   D[i][k][3]=D_average3[i][k];   
  } 
 }
}


// decision variables
dvar float+ x[demand][warehouse][instance][type] in 0..maxint;
dvar float+ w[demand][instance][type] in 0..maxint;
dvar float+ q[warehouse][type] in 0..maxint;
dvar int y[warehouse] in 0..1;  




//marget

dexpr float shipping_obj = sum(k in instance) (P[k]*((sum(i in demand, l in type) w[i,k,l]*t1 
 + sum(i in demand,j in warehouse,k in instance,l in type) x[i,j,k,l]*T[i,j])/(sum(i in demand, l in type) D[i,k,l])));



minimize shipping_obj; 
subject to {
    constraints1:
    forall(i in demand, k in instance, l in type){
       sum(j in warehouse) x[i,j,k,l] + w[i,k,l] >= D[i,k,l];
      w[i,k,l] <= D[i,k,l];      
       //w[i,k,l] <= sum(j in warehouse) x[i,j,k,l];
      }      
  constraints2:   
    forall(j in warehouse, k in instance, l in type){
       sum(i in demand) x[i,j,k,l] <= q[j,l]; 
         }
     constraints3:
         forall(j in warehouse, l in type){
          q[j,l] <= Q*y[j];           
           }
     constraints5:
         sum(j in warehouse, l in type) q[j,l] <= Q ;

     constraints6:    
         sum(j in warehouse) y[j] <= N ;
};

nbInstance = 230; 
nbType = 3;
nbWarehouses = 11;
nbDemands = 31;
Q = 10000000;
t1 = 336;
N = 6;
 

SheetConnection sheet("D_average4c1.xlsx");

D_average1  from SheetRead(sheet,"'item1'!A1:HV31");
D_average2  from SheetRead(sheet,"'item2'!A1:HV31");
D_average3  from SheetRead(sheet,"'item3'!A1:HV31");
P from SheetRead(sheet,"'P'!A1:HV1");
T from SheetRead(sheet,"'T'!A1:K31");

 /*test the D_average4c4.xlsx

nbInstance = 230;
nbType = 3;
nbWarehouses = 31;
nbDemands = 155;
Q = 10000000;
t1 = 336;
N = 24;
 

SheetConnection sheet("D_average4c4.xlsx");
D_average1  from SheetRead(sheet,"'item1'!A1:HV155");
D_average2  from SheetRead(sheet,"'item2'!A1:HV155");
D_average3  from SheetRead(sheet,"'item3'!A1:HV155");
P from SheetRead(sheet,"'P'!A1:HV1");
T from SheetRead(sheet,"'T'!A1:AE155");

*/

I cannot find the   specific error, and  I cannot  understand the meaning of " c0000005 EXCEPTION_ACCESS_VIOLATION"，my projects are  all in the attachments.



















Hi

you get an out of memory error.

If you rewrite your objective into

dexpr float shipping_obj = sum(k in instance) (P[k]*((sum(i in demand, l in type) w[i,k,l]*t1
 //+ sum(i in demand,j in warehouse,k in instance,l in type) x[i,j,k,l]*T[i,j])/(sum(i in demand, l in type) D[i,k,l]
 )));

then it works.

So I think you should check your objective. You seem to have a parenthesis issue

Originally posted by: miamoto

i have the same problem as to "lyl523"

i have 4 GB ram that when running the program it's usage is less than 60%.

then i don't think that the problem is out of memory problem. 

the engine log file is attached.

regards

Hi,

you could open a support ticket at https://www.ibm.com/support/home/

regards

Originally posted by: miamoto

i have the same problem,
but my ram usage is always less than 60% during solving time. 

so i my problem is not out of memory error

Hi,

have you tried to open a support ticket ?

regards